已知圆C:(x-1)平方+(y-2)平方=2,P点为(2,1),过点P作圆C的切线 ,切点为A.B.求过两点的切线方程.写错了 P点是(2,-1) 是AB的方程 不是 PA PB。的方程~(>_
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![已知圆C:(x-1)平方+(y-2)平方=2,P点为(2,1),过点P作圆C的切线 ,切点为A.B.求过两点的切线方程.写错了 P点是(2,-1) 是AB的方程 不是 PA PB。的方程~(>_](/uploads/image/z/14587441-25-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86C%EF%BC%9A%EF%BC%88x-1%EF%BC%89%E5%B9%B3%E6%96%B9%2B%EF%BC%88y-2%29%E5%B9%B3%E6%96%B9%3D2%2CP%E7%82%B9%E4%B8%BA%EF%BC%882%2C1%EF%BC%89%2C%E8%BF%87%E7%82%B9P%E4%BD%9C%E5%9C%86C%E7%9A%84%E5%88%87%E7%BA%BF+%2C%E5%88%87%E7%82%B9%E4%B8%BAA.B.%E6%B1%82%E8%BF%87%E4%B8%A4%E7%82%B9%E7%9A%84%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B.%E5%86%99%E9%94%99%E4%BA%86+P%E7%82%B9%E6%98%AF%EF%BC%882%EF%BC%8C-1%EF%BC%89+%E6%98%AFAB%E7%9A%84%E6%96%B9%E7%A8%8B+%E4%B8%8D%E6%98%AF+PA+PB%E3%80%82%E7%9A%84%E6%96%B9%E7%A8%8B%7E%28%3E_)
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